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applications. Flame signal current check should indicate steady flame signal of at
least 2
µ
A for a rectification type, or 1.5
µ
A for an ultraviolet type (8
µ
A for self checking
systems). If a flame signal current with inadequate strength or fluctuation beyond 10%,
check the following to avoid the risk of unwanted flame relay dropout :
1-1) For gas or oil flames (Minipeeper):
Low supply voltage
Detector location
Defective detector wiring
Dirty viewing windows
Faulty Minipeeper
1-2) For oil flames (Photocell):
Detector location & wiring
Smoky flame or poorly adjusted air shutter
Faulty Photocell
Temperature over 165 F (74 C) at photocell
1-3) For gas flames (Flame Rod):
Ignition interference (A flame signal current difference with the ignition both on and
off greater than 0.5
µ
A indicates the presence of ignition interference)
Insufficient ground (must be at least 4 times the detector area)
Flame lifting off burner head (ground), or not continuously in contact with the flame
rod
Temperature in excess of 600
o
F (316
o
C) at the flame electrode insulator causing
short to ground.
HOLD
The hold feature freezes the display for later view. Press the
HOLD
button
momentarily toggles to hold
mode in the following function(s):
Single Display Models: All functions
Twin Display Models: Upper display ACA function
MAX
The max feature compares and displays the measured maximum value as fast as
30ms with auto-ranging capability. Press the
MAX
button for 1 second or more
toggles to max feature in the following function(s):
Single Display Models: DCV, ACV & ACA functions
Twin Display Models: Upper display ACA function
